btrfs: fix race between quota disable and quota assign ioctls
[platform/kernel/linux-rpi.git] / drivers / scsi / scsi_transport_sas.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2005-2006 Dell Inc.
4  *
5  * Serial Attached SCSI (SAS) transport class.
6  *
7  * The SAS transport class contains common code to deal with SAS HBAs,
8  * an aproximated representation of SAS topologies in the driver model,
9  * and various sysfs attributes to expose these topologies and management
10  * interfaces to userspace.
11  *
12  * In addition to the basic SCSI core objects this transport class
13  * introduces two additional intermediate objects:  The SAS PHY
14  * as represented by struct sas_phy defines an "outgoing" PHY on
15  * a SAS HBA or Expander, and the SAS remote PHY represented by
16  * struct sas_rphy defines an "incoming" PHY on a SAS Expander or
17  * end device.  Note that this is purely a software concept, the
18  * underlying hardware for a PHY and a remote PHY is the exactly
19  * the same.
20  *
21  * There is no concept of a SAS port in this code, users can see
22  * what PHYs form a wide port based on the port_identifier attribute,
23  * which is the same for all PHYs in a port.
24  */
25
26 #include <linux/init.h>
27 #include <linux/module.h>
28 #include <linux/jiffies.h>
29 #include <linux/err.h>
30 #include <linux/slab.h>
31 #include <linux/string.h>
32 #include <linux/blkdev.h>
33 #include <linux/bsg.h>
34
35 #include <scsi/scsi.h>
36 #include <scsi/scsi_cmnd.h>
37 #include <scsi/scsi_request.h>
38 #include <scsi/scsi_device.h>
39 #include <scsi/scsi_host.h>
40 #include <scsi/scsi_transport.h>
41 #include <scsi/scsi_transport_sas.h>
42
43 #include "scsi_sas_internal.h"
44 struct sas_host_attrs {
45         struct list_head rphy_list;
46         struct mutex lock;
47         struct request_queue *q;
48         u32 next_target_id;
49         u32 next_expander_id;
50         int next_port_id;
51 };
52 #define to_sas_host_attrs(host) ((struct sas_host_attrs *)(host)->shost_data)
53
54
55 /*
56  * Hack to allow attributes of the same name in different objects.
57  */
58 #define SAS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
59         struct device_attribute dev_attr_##_prefix##_##_name = \
60         __ATTR(_name,_mode,_show,_store)
61
62
63 /*
64  * Pretty printing helpers
65  */
66
67 #define sas_bitfield_name_match(title, table)                   \
68 static ssize_t                                                  \
69 get_sas_##title##_names(u32 table_key, char *buf)               \
70 {                                                               \
71         char *prefix = "";                                      \
72         ssize_t len = 0;                                        \
73         int i;                                                  \
74                                                                 \
75         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
76                 if (table[i].value & table_key) {               \
77                         len += sprintf(buf + len, "%s%s",       \
78                                 prefix, table[i].name);         \
79                         prefix = ", ";                          \
80                 }                                               \
81         }                                                       \
82         len += sprintf(buf + len, "\n");                        \
83         return len;                                             \
84 }
85
86 #define sas_bitfield_name_set(title, table)                     \
87 static ssize_t                                                  \
88 set_sas_##title##_names(u32 *table_key, const char *buf)        \
89 {                                                               \
90         ssize_t len = 0;                                        \
91         int i;                                                  \
92                                                                 \
93         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
94                 len = strlen(table[i].name);                    \
95                 if (strncmp(buf, table[i].name, len) == 0 &&    \
96                     (buf[len] == '\n' || buf[len] == '\0')) {   \
97                         *table_key = table[i].value;            \
98                         return 0;                               \
99                 }                                               \
100         }                                                       \
101         return -EINVAL;                                         \
102 }
103
104 #define sas_bitfield_name_search(title, table)                  \
105 static ssize_t                                                  \
106 get_sas_##title##_names(u32 table_key, char *buf)               \
107 {                                                               \
108         ssize_t len = 0;                                        \
109         int i;                                                  \
110                                                                 \
111         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
112                 if (table[i].value == table_key) {              \
113                         len += sprintf(buf + len, "%s",         \
114                                 table[i].name);                 \
115                         break;                                  \
116                 }                                               \
117         }                                                       \
118         len += sprintf(buf + len, "\n");                        \
119         return len;                                             \
120 }
121
122 static struct {
123         u32             value;
124         char            *name;
125 } sas_device_type_names[] = {
126         { SAS_PHY_UNUSED,               "unused" },
127         { SAS_END_DEVICE,               "end device" },
128         { SAS_EDGE_EXPANDER_DEVICE,     "edge expander" },
129         { SAS_FANOUT_EXPANDER_DEVICE,   "fanout expander" },
130 };
131 sas_bitfield_name_search(device_type, sas_device_type_names)
132
133
134 static struct {
135         u32             value;
136         char            *name;
137 } sas_protocol_names[] = {
138         { SAS_PROTOCOL_SATA,            "sata" },
139         { SAS_PROTOCOL_SMP,             "smp" },
140         { SAS_PROTOCOL_STP,             "stp" },
141         { SAS_PROTOCOL_SSP,             "ssp" },
142 };
143 sas_bitfield_name_match(protocol, sas_protocol_names)
144
145 static struct {
146         u32             value;
147         char            *name;
148 } sas_linkspeed_names[] = {
149         { SAS_LINK_RATE_UNKNOWN,        "Unknown" },
150         { SAS_PHY_DISABLED,             "Phy disabled" },
151         { SAS_LINK_RATE_FAILED,         "Link Rate failed" },
152         { SAS_SATA_SPINUP_HOLD,         "Spin-up hold" },
153         { SAS_LINK_RATE_1_5_GBPS,       "1.5 Gbit" },
154         { SAS_LINK_RATE_3_0_GBPS,       "3.0 Gbit" },
155         { SAS_LINK_RATE_6_0_GBPS,       "6.0 Gbit" },
156         { SAS_LINK_RATE_12_0_GBPS,      "12.0 Gbit" },
157 };
158 sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
159 sas_bitfield_name_set(linkspeed, sas_linkspeed_names)
160
161 static struct sas_end_device *sas_sdev_to_rdev(struct scsi_device *sdev)
162 {
163         struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
164         struct sas_end_device *rdev;
165
166         BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
167
168         rdev = rphy_to_end_device(rphy);
169         return rdev;
170 }
171
172 static int sas_smp_dispatch(struct bsg_job *job)
173 {
174         struct Scsi_Host *shost = dev_to_shost(job->dev);
175         struct sas_rphy *rphy = NULL;
176
177         if (!scsi_is_host_device(job->dev))
178                 rphy = dev_to_rphy(job->dev);
179
180         if (!job->reply_payload.payload_len) {
181                 dev_warn(job->dev, "space for a smp response is missing\n");
182                 bsg_job_done(job, -EINVAL, 0);
183                 return 0;
184         }
185
186         to_sas_internal(shost->transportt)->f->smp_handler(job, shost, rphy);
187         return 0;
188 }
189
190 static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
191 {
192         struct request_queue *q;
193
194         if (!to_sas_internal(shost->transportt)->f->smp_handler) {
195                 printk("%s can't handle SMP requests\n", shost->hostt->name);
196                 return 0;
197         }
198
199         if (rphy) {
200                 q = bsg_setup_queue(&rphy->dev, dev_name(&rphy->dev),
201                                 sas_smp_dispatch, NULL, 0);
202                 if (IS_ERR(q))
203                         return PTR_ERR(q);
204                 rphy->q = q;
205         } else {
206                 char name[20];
207
208                 snprintf(name, sizeof(name), "sas_host%d", shost->host_no);
209                 q = bsg_setup_queue(&shost->shost_gendev, name,
210                                 sas_smp_dispatch, NULL, 0);
211                 if (IS_ERR(q))
212                         return PTR_ERR(q);
213                 to_sas_host_attrs(shost)->q = q;
214         }
215
216         return 0;
217 }
218
219 /*
220  * SAS host attributes
221  */
222
223 static int sas_host_setup(struct transport_container *tc, struct device *dev,
224                           struct device *cdev)
225 {
226         struct Scsi_Host *shost = dev_to_shost(dev);
227         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
228
229         INIT_LIST_HEAD(&sas_host->rphy_list);
230         mutex_init(&sas_host->lock);
231         sas_host->next_target_id = 0;
232         sas_host->next_expander_id = 0;
233         sas_host->next_port_id = 0;
234
235         if (sas_bsg_initialize(shost, NULL))
236                 dev_printk(KERN_ERR, dev, "fail to a bsg device %d\n",
237                            shost->host_no);
238
239         return 0;
240 }
241
242 static int sas_host_remove(struct transport_container *tc, struct device *dev,
243                            struct device *cdev)
244 {
245         struct Scsi_Host *shost = dev_to_shost(dev);
246         struct request_queue *q = to_sas_host_attrs(shost)->q;
247
248         bsg_remove_queue(q);
249         return 0;
250 }
251
252 static DECLARE_TRANSPORT_CLASS(sas_host_class,
253                 "sas_host", sas_host_setup, sas_host_remove, NULL);
254
255 static int sas_host_match(struct attribute_container *cont,
256                             struct device *dev)
257 {
258         struct Scsi_Host *shost;
259         struct sas_internal *i;
260
261         if (!scsi_is_host_device(dev))
262                 return 0;
263         shost = dev_to_shost(dev);
264
265         if (!shost->transportt)
266                 return 0;
267         if (shost->transportt->host_attrs.ac.class !=
268                         &sas_host_class.class)
269                 return 0;
270
271         i = to_sas_internal(shost->transportt);
272         return &i->t.host_attrs.ac == cont;
273 }
274
275 static int do_sas_phy_delete(struct device *dev, void *data)
276 {
277         int pass = (int)(unsigned long)data;
278
279         if (pass == 0 && scsi_is_sas_port(dev))
280                 sas_port_delete(dev_to_sas_port(dev));
281         else if (pass == 1 && scsi_is_sas_phy(dev))
282                 sas_phy_delete(dev_to_phy(dev));
283         return 0;
284 }
285
286 /**
287  * sas_remove_children  -  tear down a devices SAS data structures
288  * @dev:        device belonging to the sas object
289  *
290  * Removes all SAS PHYs and remote PHYs for a given object
291  */
292 void sas_remove_children(struct device *dev)
293 {
294         device_for_each_child(dev, (void *)0, do_sas_phy_delete);
295         device_for_each_child(dev, (void *)1, do_sas_phy_delete);
296 }
297 EXPORT_SYMBOL(sas_remove_children);
298
299 /**
300  * sas_remove_host  -  tear down a Scsi_Host's SAS data structures
301  * @shost:      Scsi Host that is torn down
302  *
303  * Removes all SAS PHYs and remote PHYs for a given Scsi_Host and remove the
304  * Scsi_Host as well.
305  *
306  * Note: Do not call scsi_remove_host() on the Scsi_Host any more, as it is
307  * already removed.
308  */
309 void sas_remove_host(struct Scsi_Host *shost)
310 {
311         sas_remove_children(&shost->shost_gendev);
312         scsi_remove_host(shost);
313 }
314 EXPORT_SYMBOL(sas_remove_host);
315
316 /**
317  * sas_get_address - return the SAS address of the device
318  * @sdev: scsi device
319  *
320  * Returns the SAS address of the scsi device
321  */
322 u64 sas_get_address(struct scsi_device *sdev)
323 {
324         struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
325
326         return rdev->rphy.identify.sas_address;
327 }
328 EXPORT_SYMBOL(sas_get_address);
329
330 /**
331  * sas_tlr_supported - checking TLR bit in vpd 0x90
332  * @sdev: scsi device struct
333  *
334  * Check Transport Layer Retries are supported or not.
335  * If vpd page 0x90 is present, TRL is supported.
336  *
337  */
338 unsigned int
339 sas_tlr_supported(struct scsi_device *sdev)
340 {
341         const int vpd_len = 32;
342         struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
343         char *buffer = kzalloc(vpd_len, GFP_KERNEL);
344         int ret = 0;
345
346         if (!buffer)
347                 goto out;
348
349         if (scsi_get_vpd_page(sdev, 0x90, buffer, vpd_len))
350                 goto out;
351
352         /*
353          * Magic numbers: the VPD Protocol page (0x90)
354          * has a 4 byte header and then one entry per device port
355          * the TLR bit is at offset 8 on each port entry
356          * if we take the first port, that's at total offset 12
357          */
358         ret = buffer[12] & 0x01;
359
360  out:
361         kfree(buffer);
362         rdev->tlr_supported = ret;
363         return ret;
364
365 }
366 EXPORT_SYMBOL_GPL(sas_tlr_supported);
367
368 /**
369  * sas_disable_tlr - setting TLR flags
370  * @sdev: scsi device struct
371  *
372  * Seting tlr_enabled flag to 0.
373  *
374  */
375 void
376 sas_disable_tlr(struct scsi_device *sdev)
377 {
378         struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
379
380         rdev->tlr_enabled = 0;
381 }
382 EXPORT_SYMBOL_GPL(sas_disable_tlr);
383
384 /**
385  * sas_enable_tlr - setting TLR flags
386  * @sdev: scsi device struct
387  *
388  * Seting tlr_enabled flag 1.
389  *
390  */
391 void sas_enable_tlr(struct scsi_device *sdev)
392 {
393         unsigned int tlr_supported = 0;
394         tlr_supported  = sas_tlr_supported(sdev);
395
396         if (tlr_supported) {
397                 struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
398
399                 rdev->tlr_enabled = 1;
400         }
401
402         return;
403 }
404 EXPORT_SYMBOL_GPL(sas_enable_tlr);
405
406 unsigned int sas_is_tlr_enabled(struct scsi_device *sdev)
407 {
408         struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
409         return rdev->tlr_enabled;
410 }
411 EXPORT_SYMBOL_GPL(sas_is_tlr_enabled);
412
413 /*
414  * SAS Phy attributes
415  */
416
417 #define sas_phy_show_simple(field, name, format_string, cast)           \
418 static ssize_t                                                          \
419 show_sas_phy_##name(struct device *dev,                                 \
420                     struct device_attribute *attr, char *buf)           \
421 {                                                                       \
422         struct sas_phy *phy = transport_class_to_phy(dev);              \
423                                                                         \
424         return snprintf(buf, 20, format_string, cast phy->field);       \
425 }
426
427 #define sas_phy_simple_attr(field, name, format_string, type)           \
428         sas_phy_show_simple(field, name, format_string, (type)) \
429 static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
430
431 #define sas_phy_show_protocol(field, name)                              \
432 static ssize_t                                                          \
433 show_sas_phy_##name(struct device *dev,                                 \
434                     struct device_attribute *attr, char *buf)           \
435 {                                                                       \
436         struct sas_phy *phy = transport_class_to_phy(dev);              \
437                                                                         \
438         if (!phy->field)                                                \
439                 return snprintf(buf, 20, "none\n");                     \
440         return get_sas_protocol_names(phy->field, buf);         \
441 }
442
443 #define sas_phy_protocol_attr(field, name)                              \
444         sas_phy_show_protocol(field, name)                              \
445 static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
446
447 #define sas_phy_show_linkspeed(field)                                   \
448 static ssize_t                                                          \
449 show_sas_phy_##field(struct device *dev,                                \
450                      struct device_attribute *attr, char *buf)          \
451 {                                                                       \
452         struct sas_phy *phy = transport_class_to_phy(dev);              \
453                                                                         \
454         return get_sas_linkspeed_names(phy->field, buf);                \
455 }
456
457 /* Fudge to tell if we're minimum or maximum */
458 #define sas_phy_store_linkspeed(field)                                  \
459 static ssize_t                                                          \
460 store_sas_phy_##field(struct device *dev,                               \
461                       struct device_attribute *attr,                    \
462                       const char *buf,  size_t count)                   \
463 {                                                                       \
464         struct sas_phy *phy = transport_class_to_phy(dev);              \
465         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);        \
466         struct sas_internal *i = to_sas_internal(shost->transportt);    \
467         u32 value;                                                      \
468         struct sas_phy_linkrates rates = {0};                           \
469         int error;                                                      \
470                                                                         \
471         error = set_sas_linkspeed_names(&value, buf);                   \
472         if (error)                                                      \
473                 return error;                                           \
474         rates.field = value;                                            \
475         error = i->f->set_phy_speed(phy, &rates);                       \
476                                                                         \
477         return error ? error : count;                                   \
478 }
479
480 #define sas_phy_linkspeed_rw_attr(field)                                \
481         sas_phy_show_linkspeed(field)                                   \
482         sas_phy_store_linkspeed(field)                                  \
483 static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field,                \
484         store_sas_phy_##field)
485
486 #define sas_phy_linkspeed_attr(field)                                   \
487         sas_phy_show_linkspeed(field)                                   \
488 static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
489
490
491 #define sas_phy_show_linkerror(field)                                   \
492 static ssize_t                                                          \
493 show_sas_phy_##field(struct device *dev,                                \
494                      struct device_attribute *attr, char *buf)          \
495 {                                                                       \
496         struct sas_phy *phy = transport_class_to_phy(dev);              \
497         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);        \
498         struct sas_internal *i = to_sas_internal(shost->transportt);    \
499         int error;                                                      \
500                                                                         \
501         error = i->f->get_linkerrors ? i->f->get_linkerrors(phy) : 0;   \
502         if (error)                                                      \
503                 return error;                                           \
504         return snprintf(buf, 20, "%u\n", phy->field);                   \
505 }
506
507 #define sas_phy_linkerror_attr(field)                                   \
508         sas_phy_show_linkerror(field)                                   \
509 static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
510
511
512 static ssize_t
513 show_sas_device_type(struct device *dev,
514                      struct device_attribute *attr, char *buf)
515 {
516         struct sas_phy *phy = transport_class_to_phy(dev);
517
518         if (!phy->identify.device_type)
519                 return snprintf(buf, 20, "none\n");
520         return get_sas_device_type_names(phy->identify.device_type, buf);
521 }
522 static DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
523
524 static ssize_t do_sas_phy_enable(struct device *dev,
525                 size_t count, int enable)
526 {
527         struct sas_phy *phy = transport_class_to_phy(dev);
528         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
529         struct sas_internal *i = to_sas_internal(shost->transportt);
530         int error;
531
532         error = i->f->phy_enable(phy, enable);
533         if (error)
534                 return error;
535         phy->enabled = enable;
536         return count;
537 };
538
539 static ssize_t
540 store_sas_phy_enable(struct device *dev, struct device_attribute *attr,
541                      const char *buf, size_t count)
542 {
543         if (count < 1)
544                 return -EINVAL;
545
546         switch (buf[0]) {
547         case '0':
548                 do_sas_phy_enable(dev, count, 0);
549                 break;
550         case '1':
551                 do_sas_phy_enable(dev, count, 1);
552                 break;
553         default:
554                 return -EINVAL;
555         }
556
557         return count;
558 }
559
560 static ssize_t
561 show_sas_phy_enable(struct device *dev, struct device_attribute *attr,
562                     char *buf)
563 {
564         struct sas_phy *phy = transport_class_to_phy(dev);
565
566         return snprintf(buf, 20, "%d\n", phy->enabled);
567 }
568
569 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, show_sas_phy_enable,
570                          store_sas_phy_enable);
571
572 static ssize_t
573 do_sas_phy_reset(struct device *dev, size_t count, int hard_reset)
574 {
575         struct sas_phy *phy = transport_class_to_phy(dev);
576         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
577         struct sas_internal *i = to_sas_internal(shost->transportt);
578         int error;
579
580         error = i->f->phy_reset(phy, hard_reset);
581         if (error)
582                 return error;
583         phy->enabled = 1;
584         return count;
585 };
586
587 static ssize_t
588 store_sas_link_reset(struct device *dev, struct device_attribute *attr,
589                      const char *buf, size_t count)
590 {
591         return do_sas_phy_reset(dev, count, 0);
592 }
593 static DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);
594
595 static ssize_t
596 store_sas_hard_reset(struct device *dev, struct device_attribute *attr,
597                      const char *buf, size_t count)
598 {
599         return do_sas_phy_reset(dev, count, 1);
600 }
601 static DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);
602
603 sas_phy_protocol_attr(identify.initiator_port_protocols,
604                 initiator_port_protocols);
605 sas_phy_protocol_attr(identify.target_port_protocols,
606                 target_port_protocols);
607 sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
608                 unsigned long long);
609 sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
610 sas_phy_linkspeed_attr(negotiated_linkrate);
611 sas_phy_linkspeed_attr(minimum_linkrate_hw);
612 sas_phy_linkspeed_rw_attr(minimum_linkrate);
613 sas_phy_linkspeed_attr(maximum_linkrate_hw);
614 sas_phy_linkspeed_rw_attr(maximum_linkrate);
615 sas_phy_linkerror_attr(invalid_dword_count);
616 sas_phy_linkerror_attr(running_disparity_error_count);
617 sas_phy_linkerror_attr(loss_of_dword_sync_count);
618 sas_phy_linkerror_attr(phy_reset_problem_count);
619
620 static int sas_phy_setup(struct transport_container *tc, struct device *dev,
621                          struct device *cdev)
622 {
623         struct sas_phy *phy = dev_to_phy(dev);
624         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
625         struct sas_internal *i = to_sas_internal(shost->transportt);
626
627         if (i->f->phy_setup)
628                 i->f->phy_setup(phy);
629
630         return 0;
631 }
632
633 static DECLARE_TRANSPORT_CLASS(sas_phy_class,
634                 "sas_phy", sas_phy_setup, NULL, NULL);
635
636 static int sas_phy_match(struct attribute_container *cont, struct device *dev)
637 {
638         struct Scsi_Host *shost;
639         struct sas_internal *i;
640
641         if (!scsi_is_sas_phy(dev))
642                 return 0;
643         shost = dev_to_shost(dev->parent);
644
645         if (!shost->transportt)
646                 return 0;
647         if (shost->transportt->host_attrs.ac.class !=
648                         &sas_host_class.class)
649                 return 0;
650
651         i = to_sas_internal(shost->transportt);
652         return &i->phy_attr_cont.ac == cont;
653 }
654
655 static void sas_phy_release(struct device *dev)
656 {
657         struct sas_phy *phy = dev_to_phy(dev);
658         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
659         struct sas_internal *i = to_sas_internal(shost->transportt);
660
661         if (i->f->phy_release)
662                 i->f->phy_release(phy);
663         put_device(dev->parent);
664         kfree(phy);
665 }
666
667 /**
668  * sas_phy_alloc  -  allocates and initialize a SAS PHY structure
669  * @parent:     Parent device
670  * @number:     Phy index
671  *
672  * Allocates an SAS PHY structure.  It will be added in the device tree
673  * below the device specified by @parent, which has to be either a Scsi_Host
674  * or sas_rphy.
675  *
676  * Returns:
677  *      SAS PHY allocated or %NULL if the allocation failed.
678  */
679 struct sas_phy *sas_phy_alloc(struct device *parent, int number)
680 {
681         struct Scsi_Host *shost = dev_to_shost(parent);
682         struct sas_phy *phy;
683
684         phy = kzalloc(sizeof(*phy), GFP_KERNEL);
685         if (!phy)
686                 return NULL;
687
688         phy->number = number;
689         phy->enabled = 1;
690
691         device_initialize(&phy->dev);
692         phy->dev.parent = get_device(parent);
693         phy->dev.release = sas_phy_release;
694         INIT_LIST_HEAD(&phy->port_siblings);
695         if (scsi_is_sas_expander_device(parent)) {
696                 struct sas_rphy *rphy = dev_to_rphy(parent);
697                 dev_set_name(&phy->dev, "phy-%d:%d:%d", shost->host_no,
698                         rphy->scsi_target_id, number);
699         } else
700                 dev_set_name(&phy->dev, "phy-%d:%d", shost->host_no, number);
701
702         transport_setup_device(&phy->dev);
703
704         return phy;
705 }
706 EXPORT_SYMBOL(sas_phy_alloc);
707
708 /**
709  * sas_phy_add  -  add a SAS PHY to the device hierarchy
710  * @phy:        The PHY to be added
711  *
712  * Publishes a SAS PHY to the rest of the system.
713  */
714 int sas_phy_add(struct sas_phy *phy)
715 {
716         int error;
717
718         error = device_add(&phy->dev);
719         if (error)
720                 return error;
721
722         error = transport_add_device(&phy->dev);
723         if (error) {
724                 device_del(&phy->dev);
725                 return error;
726         }
727         transport_configure_device(&phy->dev);
728
729         return 0;
730 }
731 EXPORT_SYMBOL(sas_phy_add);
732
733 /**
734  * sas_phy_free  -  free a SAS PHY
735  * @phy:        SAS PHY to free
736  *
737  * Frees the specified SAS PHY.
738  *
739  * Note:
740  *   This function must only be called on a PHY that has not
741  *   successfully been added using sas_phy_add().
742  */
743 void sas_phy_free(struct sas_phy *phy)
744 {
745         transport_destroy_device(&phy->dev);
746         put_device(&phy->dev);
747 }
748 EXPORT_SYMBOL(sas_phy_free);
749
750 /**
751  * sas_phy_delete  -  remove SAS PHY
752  * @phy:        SAS PHY to remove
753  *
754  * Removes the specified SAS PHY.  If the SAS PHY has an
755  * associated remote PHY it is removed before.
756  */
757 void
758 sas_phy_delete(struct sas_phy *phy)
759 {
760         struct device *dev = &phy->dev;
761
762         /* this happens if the phy is still part of a port when deleted */
763         BUG_ON(!list_empty(&phy->port_siblings));
764
765         transport_remove_device(dev);
766         device_del(dev);
767         transport_destroy_device(dev);
768         put_device(dev);
769 }
770 EXPORT_SYMBOL(sas_phy_delete);
771
772 /**
773  * scsi_is_sas_phy  -  check if a struct device represents a SAS PHY
774  * @dev:        device to check
775  *
776  * Returns:
777  *      %1 if the device represents a SAS PHY, %0 else
778  */
779 int scsi_is_sas_phy(const struct device *dev)
780 {
781         return dev->release == sas_phy_release;
782 }
783 EXPORT_SYMBOL(scsi_is_sas_phy);
784
785 /*
786  * SAS Port attributes
787  */
788 #define sas_port_show_simple(field, name, format_string, cast)          \
789 static ssize_t                                                          \
790 show_sas_port_##name(struct device *dev,                                \
791                      struct device_attribute *attr, char *buf)          \
792 {                                                                       \
793         struct sas_port *port = transport_class_to_sas_port(dev);       \
794                                                                         \
795         return snprintf(buf, 20, format_string, cast port->field);      \
796 }
797
798 #define sas_port_simple_attr(field, name, format_string, type)          \
799         sas_port_show_simple(field, name, format_string, (type))        \
800 static DEVICE_ATTR(name, S_IRUGO, show_sas_port_##name, NULL)
801
802 sas_port_simple_attr(num_phys, num_phys, "%d\n", int);
803
804 static DECLARE_TRANSPORT_CLASS(sas_port_class,
805                                "sas_port", NULL, NULL, NULL);
806
807 static int sas_port_match(struct attribute_container *cont, struct device *dev)
808 {
809         struct Scsi_Host *shost;
810         struct sas_internal *i;
811
812         if (!scsi_is_sas_port(dev))
813                 return 0;
814         shost = dev_to_shost(dev->parent);
815
816         if (!shost->transportt)
817                 return 0;
818         if (shost->transportt->host_attrs.ac.class !=
819                         &sas_host_class.class)
820                 return 0;
821
822         i = to_sas_internal(shost->transportt);
823         return &i->port_attr_cont.ac == cont;
824 }
825
826
827 static void sas_port_release(struct device *dev)
828 {
829         struct sas_port *port = dev_to_sas_port(dev);
830
831         BUG_ON(!list_empty(&port->phy_list));
832
833         put_device(dev->parent);
834         kfree(port);
835 }
836
837 static void sas_port_create_link(struct sas_port *port,
838                                  struct sas_phy *phy)
839 {
840         int res;
841
842         res = sysfs_create_link(&port->dev.kobj, &phy->dev.kobj,
843                                 dev_name(&phy->dev));
844         if (res)
845                 goto err;
846         res = sysfs_create_link(&phy->dev.kobj, &port->dev.kobj, "port");
847         if (res)
848                 goto err;
849         return;
850 err:
851         printk(KERN_ERR "%s: Cannot create port links, err=%d\n",
852                __func__, res);
853 }
854
855 static void sas_port_delete_link(struct sas_port *port,
856                                  struct sas_phy *phy)
857 {
858         sysfs_remove_link(&port->dev.kobj, dev_name(&phy->dev));
859         sysfs_remove_link(&phy->dev.kobj, "port");
860 }
861
862 /** sas_port_alloc - allocate and initialize a SAS port structure
863  *
864  * @parent:     parent device
865  * @port_id:    port number
866  *
867  * Allocates a SAS port structure.  It will be added to the device tree
868  * below the device specified by @parent which must be either a Scsi_Host
869  * or a sas_expander_device.
870  *
871  * Returns %NULL on error
872  */
873 struct sas_port *sas_port_alloc(struct device *parent, int port_id)
874 {
875         struct Scsi_Host *shost = dev_to_shost(parent);
876         struct sas_port *port;
877
878         port = kzalloc(sizeof(*port), GFP_KERNEL);
879         if (!port)
880                 return NULL;
881
882         port->port_identifier = port_id;
883
884         device_initialize(&port->dev);
885
886         port->dev.parent = get_device(parent);
887         port->dev.release = sas_port_release;
888
889         mutex_init(&port->phy_list_mutex);
890         INIT_LIST_HEAD(&port->phy_list);
891
892         if (scsi_is_sas_expander_device(parent)) {
893                 struct sas_rphy *rphy = dev_to_rphy(parent);
894                 dev_set_name(&port->dev, "port-%d:%d:%d", shost->host_no,
895                              rphy->scsi_target_id, port->port_identifier);
896         } else
897                 dev_set_name(&port->dev, "port-%d:%d", shost->host_no,
898                              port->port_identifier);
899
900         transport_setup_device(&port->dev);
901
902         return port;
903 }
904 EXPORT_SYMBOL(sas_port_alloc);
905
906 /** sas_port_alloc_num - allocate and initialize a SAS port structure
907  *
908  * @parent:     parent device
909  *
910  * Allocates a SAS port structure and a number to go with it.  This
911  * interface is really for adapters where the port number has no
912  * meansing, so the sas class should manage them.  It will be added to
913  * the device tree below the device specified by @parent which must be
914  * either a Scsi_Host or a sas_expander_device.
915  *
916  * Returns %NULL on error
917  */
918 struct sas_port *sas_port_alloc_num(struct device *parent)
919 {
920         int index;
921         struct Scsi_Host *shost = dev_to_shost(parent);
922         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
923
924         /* FIXME: use idr for this eventually */
925         mutex_lock(&sas_host->lock);
926         if (scsi_is_sas_expander_device(parent)) {
927                 struct sas_rphy *rphy = dev_to_rphy(parent);
928                 struct sas_expander_device *exp = rphy_to_expander_device(rphy);
929
930                 index = exp->next_port_id++;
931         } else
932                 index = sas_host->next_port_id++;
933         mutex_unlock(&sas_host->lock);
934         return sas_port_alloc(parent, index);
935 }
936 EXPORT_SYMBOL(sas_port_alloc_num);
937
938 /**
939  * sas_port_add - add a SAS port to the device hierarchy
940  * @port:       port to be added
941  *
942  * publishes a port to the rest of the system
943  */
944 int sas_port_add(struct sas_port *port)
945 {
946         int error;
947
948         /* No phys should be added until this is made visible */
949         BUG_ON(!list_empty(&port->phy_list));
950
951         error = device_add(&port->dev);
952
953         if (error)
954                 return error;
955
956         transport_add_device(&port->dev);
957         transport_configure_device(&port->dev);
958
959         return 0;
960 }
961 EXPORT_SYMBOL(sas_port_add);
962
963 /**
964  * sas_port_free  -  free a SAS PORT
965  * @port:       SAS PORT to free
966  *
967  * Frees the specified SAS PORT.
968  *
969  * Note:
970  *   This function must only be called on a PORT that has not
971  *   successfully been added using sas_port_add().
972  */
973 void sas_port_free(struct sas_port *port)
974 {
975         transport_destroy_device(&port->dev);
976         put_device(&port->dev);
977 }
978 EXPORT_SYMBOL(sas_port_free);
979
980 /**
981  * sas_port_delete  -  remove SAS PORT
982  * @port:       SAS PORT to remove
983  *
984  * Removes the specified SAS PORT.  If the SAS PORT has an
985  * associated phys, unlink them from the port as well.
986  */
987 void sas_port_delete(struct sas_port *port)
988 {
989         struct device *dev = &port->dev;
990         struct sas_phy *phy, *tmp_phy;
991
992         if (port->rphy) {
993                 sas_rphy_delete(port->rphy);
994                 port->rphy = NULL;
995         }
996
997         mutex_lock(&port->phy_list_mutex);
998         list_for_each_entry_safe(phy, tmp_phy, &port->phy_list,
999                                  port_siblings) {
1000                 sas_port_delete_link(port, phy);
1001                 list_del_init(&phy->port_siblings);
1002         }
1003         mutex_unlock(&port->phy_list_mutex);
1004
1005         if (port->is_backlink) {
1006                 struct device *parent = port->dev.parent;
1007
1008                 sysfs_remove_link(&port->dev.kobj, dev_name(parent));
1009                 port->is_backlink = 0;
1010         }
1011
1012         transport_remove_device(dev);
1013         device_del(dev);
1014         transport_destroy_device(dev);
1015         put_device(dev);
1016 }
1017 EXPORT_SYMBOL(sas_port_delete);
1018
1019 /**
1020  * scsi_is_sas_port -  check if a struct device represents a SAS port
1021  * @dev:        device to check
1022  *
1023  * Returns:
1024  *      %1 if the device represents a SAS Port, %0 else
1025  */
1026 int scsi_is_sas_port(const struct device *dev)
1027 {
1028         return dev->release == sas_port_release;
1029 }
1030 EXPORT_SYMBOL(scsi_is_sas_port);
1031
1032 /**
1033  * sas_port_get_phy - try to take a reference on a port member
1034  * @port: port to check
1035  */
1036 struct sas_phy *sas_port_get_phy(struct sas_port *port)
1037 {
1038         struct sas_phy *phy;
1039
1040         mutex_lock(&port->phy_list_mutex);
1041         if (list_empty(&port->phy_list))
1042                 phy = NULL;
1043         else {
1044                 struct list_head *ent = port->phy_list.next;
1045
1046                 phy = list_entry(ent, typeof(*phy), port_siblings);
1047                 get_device(&phy->dev);
1048         }
1049         mutex_unlock(&port->phy_list_mutex);
1050
1051         return phy;
1052 }
1053 EXPORT_SYMBOL(sas_port_get_phy);
1054
1055 /**
1056  * sas_port_add_phy - add another phy to a port to form a wide port
1057  * @port:       port to add the phy to
1058  * @phy:        phy to add
1059  *
1060  * When a port is initially created, it is empty (has no phys).  All
1061  * ports must have at least one phy to operated, and all wide ports
1062  * must have at least two.  The current code makes no difference
1063  * between ports and wide ports, but the only object that can be
1064  * connected to a remote device is a port, so ports must be formed on
1065  * all devices with phys if they're connected to anything.
1066  */
1067 void sas_port_add_phy(struct sas_port *port, struct sas_phy *phy)
1068 {
1069         mutex_lock(&port->phy_list_mutex);
1070         if (unlikely(!list_empty(&phy->port_siblings))) {
1071                 /* make sure we're already on this port */
1072                 struct sas_phy *tmp;
1073
1074                 list_for_each_entry(tmp, &port->phy_list, port_siblings)
1075                         if (tmp == phy)
1076                                 break;
1077                 /* If this trips, you added a phy that was already
1078                  * part of a different port */
1079                 if (unlikely(tmp != phy)) {
1080                         dev_printk(KERN_ERR, &port->dev, "trying to add phy %s fails: it's already part of another port\n",
1081                                    dev_name(&phy->dev));
1082                         BUG();
1083                 }
1084         } else {
1085                 sas_port_create_link(port, phy);
1086                 list_add_tail(&phy->port_siblings, &port->phy_list);
1087                 port->num_phys++;
1088         }
1089         mutex_unlock(&port->phy_list_mutex);
1090 }
1091 EXPORT_SYMBOL(sas_port_add_phy);
1092
1093 /**
1094  * sas_port_delete_phy - remove a phy from a port or wide port
1095  * @port:       port to remove the phy from
1096  * @phy:        phy to remove
1097  *
1098  * This operation is used for tearing down ports again.  It must be
1099  * done to every port or wide port before calling sas_port_delete.
1100  */
1101 void sas_port_delete_phy(struct sas_port *port, struct sas_phy *phy)
1102 {
1103         mutex_lock(&port->phy_list_mutex);
1104         sas_port_delete_link(port, phy);
1105         list_del_init(&phy->port_siblings);
1106         port->num_phys--;
1107         mutex_unlock(&port->phy_list_mutex);
1108 }
1109 EXPORT_SYMBOL(sas_port_delete_phy);
1110
1111 void sas_port_mark_backlink(struct sas_port *port)
1112 {
1113         int res;
1114         struct device *parent = port->dev.parent->parent->parent;
1115
1116         if (port->is_backlink)
1117                 return;
1118         port->is_backlink = 1;
1119         res = sysfs_create_link(&port->dev.kobj, &parent->kobj,
1120                                 dev_name(parent));
1121         if (res)
1122                 goto err;
1123         return;
1124 err:
1125         printk(KERN_ERR "%s: Cannot create port backlink, err=%d\n",
1126                __func__, res);
1127
1128 }
1129 EXPORT_SYMBOL(sas_port_mark_backlink);
1130
1131 /*
1132  * SAS remote PHY attributes.
1133  */
1134
1135 #define sas_rphy_show_simple(field, name, format_string, cast)          \
1136 static ssize_t                                                          \
1137 show_sas_rphy_##name(struct device *dev,                                \
1138                      struct device_attribute *attr, char *buf)          \
1139 {                                                                       \
1140         struct sas_rphy *rphy = transport_class_to_rphy(dev);           \
1141                                                                         \
1142         return snprintf(buf, 20, format_string, cast rphy->field);      \
1143 }
1144
1145 #define sas_rphy_simple_attr(field, name, format_string, type)          \
1146         sas_rphy_show_simple(field, name, format_string, (type))        \
1147 static SAS_DEVICE_ATTR(rphy, name, S_IRUGO,                     \
1148                 show_sas_rphy_##name, NULL)
1149
1150 #define sas_rphy_show_protocol(field, name)                             \
1151 static ssize_t                                                          \
1152 show_sas_rphy_##name(struct device *dev,                                \
1153                      struct device_attribute *attr, char *buf)          \
1154 {                                                                       \
1155         struct sas_rphy *rphy = transport_class_to_rphy(dev);           \
1156                                                                         \
1157         if (!rphy->field)                                       \
1158                 return snprintf(buf, 20, "none\n");                     \
1159         return get_sas_protocol_names(rphy->field, buf);        \
1160 }
1161
1162 #define sas_rphy_protocol_attr(field, name)                             \
1163         sas_rphy_show_protocol(field, name)                             \
1164 static SAS_DEVICE_ATTR(rphy, name, S_IRUGO,                     \
1165                 show_sas_rphy_##name, NULL)
1166
1167 static ssize_t
1168 show_sas_rphy_device_type(struct device *dev,
1169                           struct device_attribute *attr, char *buf)
1170 {
1171         struct sas_rphy *rphy = transport_class_to_rphy(dev);
1172
1173         if (!rphy->identify.device_type)
1174                 return snprintf(buf, 20, "none\n");
1175         return get_sas_device_type_names(
1176                         rphy->identify.device_type, buf);
1177 }
1178
1179 static SAS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
1180                 show_sas_rphy_device_type, NULL);
1181
1182 static ssize_t
1183 show_sas_rphy_enclosure_identifier(struct device *dev,
1184                                    struct device_attribute *attr, char *buf)
1185 {
1186         struct sas_rphy *rphy = transport_class_to_rphy(dev);
1187         struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1188         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1189         struct sas_internal *i = to_sas_internal(shost->transportt);
1190         u64 identifier;
1191         int error;
1192
1193         error = i->f->get_enclosure_identifier(rphy, &identifier);
1194         if (error)
1195                 return error;
1196         return sprintf(buf, "0x%llx\n", (unsigned long long)identifier);
1197 }
1198
1199 static SAS_DEVICE_ATTR(rphy, enclosure_identifier, S_IRUGO,
1200                 show_sas_rphy_enclosure_identifier, NULL);
1201
1202 static ssize_t
1203 show_sas_rphy_bay_identifier(struct device *dev,
1204                              struct device_attribute *attr, char *buf)
1205 {
1206         struct sas_rphy *rphy = transport_class_to_rphy(dev);
1207         struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1208         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1209         struct sas_internal *i = to_sas_internal(shost->transportt);
1210         int val;
1211
1212         val = i->f->get_bay_identifier(rphy);
1213         if (val < 0)
1214                 return val;
1215         return sprintf(buf, "%d\n", val);
1216 }
1217
1218 static SAS_DEVICE_ATTR(rphy, bay_identifier, S_IRUGO,
1219                 show_sas_rphy_bay_identifier, NULL);
1220
1221 sas_rphy_protocol_attr(identify.initiator_port_protocols,
1222                 initiator_port_protocols);
1223 sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
1224 sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
1225                 unsigned long long);
1226 sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
1227 sas_rphy_simple_attr(scsi_target_id, scsi_target_id, "%d\n", u32);
1228
1229 /* only need 8 bytes of data plus header (4 or 8) */
1230 #define BUF_SIZE 64
1231
1232 int sas_read_port_mode_page(struct scsi_device *sdev)
1233 {
1234         char *buffer = kzalloc(BUF_SIZE, GFP_KERNEL), *msdata;
1235         struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
1236         struct scsi_mode_data mode_data;
1237         int error;
1238
1239         if (!buffer)
1240                 return -ENOMEM;
1241
1242         error = scsi_mode_sense(sdev, 1, 0x19, buffer, BUF_SIZE, 30*HZ, 3,
1243                                 &mode_data, NULL);
1244
1245         if (error)
1246                 goto out;
1247
1248         msdata = buffer +  mode_data.header_length +
1249                 mode_data.block_descriptor_length;
1250
1251         if (msdata - buffer > BUF_SIZE - 8)
1252                 goto out;
1253
1254         error = 0;
1255
1256         rdev->ready_led_meaning = msdata[2] & 0x10 ? 1 : 0;
1257         rdev->I_T_nexus_loss_timeout = (msdata[4] << 8) + msdata[5];
1258         rdev->initiator_response_timeout = (msdata[6] << 8) + msdata[7];
1259
1260  out:
1261         kfree(buffer);
1262         return error;
1263 }
1264 EXPORT_SYMBOL(sas_read_port_mode_page);
1265
1266 static DECLARE_TRANSPORT_CLASS(sas_end_dev_class,
1267                                "sas_end_device", NULL, NULL, NULL);
1268
1269 #define sas_end_dev_show_simple(field, name, format_string, cast)       \
1270 static ssize_t                                                          \
1271 show_sas_end_dev_##name(struct device *dev,                             \
1272                         struct device_attribute *attr, char *buf)       \
1273 {                                                                       \
1274         struct sas_rphy *rphy = transport_class_to_rphy(dev);           \
1275         struct sas_end_device *rdev = rphy_to_end_device(rphy);         \
1276                                                                         \
1277         return snprintf(buf, 20, format_string, cast rdev->field);      \
1278 }
1279
1280 #define sas_end_dev_simple_attr(field, name, format_string, type)       \
1281         sas_end_dev_show_simple(field, name, format_string, (type))     \
1282 static SAS_DEVICE_ATTR(end_dev, name, S_IRUGO,                  \
1283                 show_sas_end_dev_##name, NULL)
1284
1285 sas_end_dev_simple_attr(ready_led_meaning, ready_led_meaning, "%d\n", int);
1286 sas_end_dev_simple_attr(I_T_nexus_loss_timeout, I_T_nexus_loss_timeout,
1287                         "%d\n", int);
1288 sas_end_dev_simple_attr(initiator_response_timeout, initiator_response_timeout,
1289                         "%d\n", int);
1290 sas_end_dev_simple_attr(tlr_supported, tlr_supported,
1291                         "%d\n", int);
1292 sas_end_dev_simple_attr(tlr_enabled, tlr_enabled,
1293                         "%d\n", int);
1294
1295 static DECLARE_TRANSPORT_CLASS(sas_expander_class,
1296                                "sas_expander", NULL, NULL, NULL);
1297
1298 #define sas_expander_show_simple(field, name, format_string, cast)      \
1299 static ssize_t                                                          \
1300 show_sas_expander_##name(struct device *dev,                            \
1301                          struct device_attribute *attr, char *buf)      \
1302 {                                                                       \
1303         struct sas_rphy *rphy = transport_class_to_rphy(dev);           \
1304         struct sas_expander_device *edev = rphy_to_expander_device(rphy); \
1305                                                                         \
1306         return snprintf(buf, 20, format_string, cast edev->field);      \
1307 }
1308
1309 #define sas_expander_simple_attr(field, name, format_string, type)      \
1310         sas_expander_show_simple(field, name, format_string, (type))    \
1311 static SAS_DEVICE_ATTR(expander, name, S_IRUGO,                         \
1312                 show_sas_expander_##name, NULL)
1313
1314 sas_expander_simple_attr(vendor_id, vendor_id, "%s\n", char *);
1315 sas_expander_simple_attr(product_id, product_id, "%s\n", char *);
1316 sas_expander_simple_attr(product_rev, product_rev, "%s\n", char *);
1317 sas_expander_simple_attr(component_vendor_id, component_vendor_id,
1318                          "%s\n", char *);
1319 sas_expander_simple_attr(component_id, component_id, "%u\n", unsigned int);
1320 sas_expander_simple_attr(component_revision_id, component_revision_id, "%u\n",
1321                          unsigned int);
1322 sas_expander_simple_attr(level, level, "%d\n", int);
1323
1324 static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
1325                 "sas_device", NULL, NULL, NULL);
1326
1327 static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
1328 {
1329         struct Scsi_Host *shost;
1330         struct sas_internal *i;
1331
1332         if (!scsi_is_sas_rphy(dev))
1333                 return 0;
1334         shost = dev_to_shost(dev->parent->parent);
1335
1336         if (!shost->transportt)
1337                 return 0;
1338         if (shost->transportt->host_attrs.ac.class !=
1339                         &sas_host_class.class)
1340                 return 0;
1341
1342         i = to_sas_internal(shost->transportt);
1343         return &i->rphy_attr_cont.ac == cont;
1344 }
1345
1346 static int sas_end_dev_match(struct attribute_container *cont,
1347                              struct device *dev)
1348 {
1349         struct Scsi_Host *shost;
1350         struct sas_internal *i;
1351         struct sas_rphy *rphy;
1352
1353         if (!scsi_is_sas_rphy(dev))
1354                 return 0;
1355         shost = dev_to_shost(dev->parent->parent);
1356         rphy = dev_to_rphy(dev);
1357
1358         if (!shost->transportt)
1359                 return 0;
1360         if (shost->transportt->host_attrs.ac.class !=
1361                         &sas_host_class.class)
1362                 return 0;
1363
1364         i = to_sas_internal(shost->transportt);
1365         return &i->end_dev_attr_cont.ac == cont &&
1366                 rphy->identify.device_type == SAS_END_DEVICE;
1367 }
1368
1369 static int sas_expander_match(struct attribute_container *cont,
1370                               struct device *dev)
1371 {
1372         struct Scsi_Host *shost;
1373         struct sas_internal *i;
1374         struct sas_rphy *rphy;
1375
1376         if (!scsi_is_sas_rphy(dev))
1377                 return 0;
1378         shost = dev_to_shost(dev->parent->parent);
1379         rphy = dev_to_rphy(dev);
1380
1381         if (!shost->transportt)
1382                 return 0;
1383         if (shost->transportt->host_attrs.ac.class !=
1384                         &sas_host_class.class)
1385                 return 0;
1386
1387         i = to_sas_internal(shost->transportt);
1388         return &i->expander_attr_cont.ac == cont &&
1389                 (rphy->identify.device_type == SAS_EDGE_EXPANDER_DEVICE ||
1390                  rphy->identify.device_type == SAS_FANOUT_EXPANDER_DEVICE);
1391 }
1392
1393 static void sas_expander_release(struct device *dev)
1394 {
1395         struct sas_rphy *rphy = dev_to_rphy(dev);
1396         struct sas_expander_device *edev = rphy_to_expander_device(rphy);
1397
1398         put_device(dev->parent);
1399         kfree(edev);
1400 }
1401
1402 static void sas_end_device_release(struct device *dev)
1403 {
1404         struct sas_rphy *rphy = dev_to_rphy(dev);
1405         struct sas_end_device *edev = rphy_to_end_device(rphy);
1406
1407         put_device(dev->parent);
1408         kfree(edev);
1409 }
1410
1411 /**
1412  * sas_rphy_initialize - common rphy initialization
1413  * @rphy:       rphy to initialise
1414  *
1415  * Used by both sas_end_device_alloc() and sas_expander_alloc() to
1416  * initialise the common rphy component of each.
1417  */
1418 static void sas_rphy_initialize(struct sas_rphy *rphy)
1419 {
1420         INIT_LIST_HEAD(&rphy->list);
1421 }
1422
1423 /**
1424  * sas_end_device_alloc - allocate an rphy for an end device
1425  * @parent: which port
1426  *
1427  * Allocates an SAS remote PHY structure, connected to @parent.
1428  *
1429  * Returns:
1430  *      SAS PHY allocated or %NULL if the allocation failed.
1431  */
1432 struct sas_rphy *sas_end_device_alloc(struct sas_port *parent)
1433 {
1434         struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1435         struct sas_end_device *rdev;
1436
1437         rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1438         if (!rdev) {
1439                 return NULL;
1440         }
1441
1442         device_initialize(&rdev->rphy.dev);
1443         rdev->rphy.dev.parent = get_device(&parent->dev);
1444         rdev->rphy.dev.release = sas_end_device_release;
1445         if (scsi_is_sas_expander_device(parent->dev.parent)) {
1446                 struct sas_rphy *rphy = dev_to_rphy(parent->dev.parent);
1447                 dev_set_name(&rdev->rphy.dev, "end_device-%d:%d:%d",
1448                              shost->host_no, rphy->scsi_target_id,
1449                              parent->port_identifier);
1450         } else
1451                 dev_set_name(&rdev->rphy.dev, "end_device-%d:%d",
1452                              shost->host_no, parent->port_identifier);
1453         rdev->rphy.identify.device_type = SAS_END_DEVICE;
1454         sas_rphy_initialize(&rdev->rphy);
1455         transport_setup_device(&rdev->rphy.dev);
1456
1457         return &rdev->rphy;
1458 }
1459 EXPORT_SYMBOL(sas_end_device_alloc);
1460
1461 /**
1462  * sas_expander_alloc - allocate an rphy for an end device
1463  * @parent: which port
1464  * @type: SAS_EDGE_EXPANDER_DEVICE or SAS_FANOUT_EXPANDER_DEVICE
1465  *
1466  * Allocates an SAS remote PHY structure, connected to @parent.
1467  *
1468  * Returns:
1469  *      SAS PHY allocated or %NULL if the allocation failed.
1470  */
1471 struct sas_rphy *sas_expander_alloc(struct sas_port *parent,
1472                                     enum sas_device_type type)
1473 {
1474         struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1475         struct sas_expander_device *rdev;
1476         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1477
1478         BUG_ON(type != SAS_EDGE_EXPANDER_DEVICE &&
1479                type != SAS_FANOUT_EXPANDER_DEVICE);
1480
1481         rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1482         if (!rdev) {
1483                 return NULL;
1484         }
1485
1486         device_initialize(&rdev->rphy.dev);
1487         rdev->rphy.dev.parent = get_device(&parent->dev);
1488         rdev->rphy.dev.release = sas_expander_release;
1489         mutex_lock(&sas_host->lock);
1490         rdev->rphy.scsi_target_id = sas_host->next_expander_id++;
1491         mutex_unlock(&sas_host->lock);
1492         dev_set_name(&rdev->rphy.dev, "expander-%d:%d",
1493                      shost->host_no, rdev->rphy.scsi_target_id);
1494         rdev->rphy.identify.device_type = type;
1495         sas_rphy_initialize(&rdev->rphy);
1496         transport_setup_device(&rdev->rphy.dev);
1497
1498         return &rdev->rphy;
1499 }
1500 EXPORT_SYMBOL(sas_expander_alloc);
1501
1502 /**
1503  * sas_rphy_add  -  add a SAS remote PHY to the device hierarchy
1504  * @rphy:       The remote PHY to be added
1505  *
1506  * Publishes a SAS remote PHY to the rest of the system.
1507  */
1508 int sas_rphy_add(struct sas_rphy *rphy)
1509 {
1510         struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1511         struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
1512         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1513         struct sas_identify *identify = &rphy->identify;
1514         int error;
1515
1516         if (parent->rphy)
1517                 return -ENXIO;
1518         parent->rphy = rphy;
1519
1520         error = device_add(&rphy->dev);
1521         if (error)
1522                 return error;
1523         transport_add_device(&rphy->dev);
1524         transport_configure_device(&rphy->dev);
1525         if (sas_bsg_initialize(shost, rphy))
1526                 printk("fail to a bsg device %s\n", dev_name(&rphy->dev));
1527
1528
1529         mutex_lock(&sas_host->lock);
1530         list_add_tail(&rphy->list, &sas_host->rphy_list);
1531         if (identify->device_type == SAS_END_DEVICE &&
1532             (identify->target_port_protocols &
1533              (SAS_PROTOCOL_SSP | SAS_PROTOCOL_STP | SAS_PROTOCOL_SATA)))
1534                 rphy->scsi_target_id = sas_host->next_target_id++;
1535         else if (identify->device_type == SAS_END_DEVICE)
1536                 rphy->scsi_target_id = -1;
1537         mutex_unlock(&sas_host->lock);
1538
1539         if (identify->device_type == SAS_END_DEVICE &&
1540             rphy->scsi_target_id != -1) {
1541                 int lun;
1542
1543                 if (identify->target_port_protocols & SAS_PROTOCOL_SSP)
1544                         lun = SCAN_WILD_CARD;
1545                 else
1546                         lun = 0;
1547
1548                 scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id, lun,
1549                                  SCSI_SCAN_INITIAL);
1550         }
1551
1552         return 0;
1553 }
1554 EXPORT_SYMBOL(sas_rphy_add);
1555
1556 /**
1557  * sas_rphy_free  -  free a SAS remote PHY
1558  * @rphy: SAS remote PHY to free
1559  *
1560  * Frees the specified SAS remote PHY.
1561  *
1562  * Note:
1563  *   This function must only be called on a remote
1564  *   PHY that has not successfully been added using
1565  *   sas_rphy_add() (or has been sas_rphy_remove()'d)
1566  */
1567 void sas_rphy_free(struct sas_rphy *rphy)
1568 {
1569         struct device *dev = &rphy->dev;
1570         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
1571         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1572
1573         mutex_lock(&sas_host->lock);
1574         list_del(&rphy->list);
1575         mutex_unlock(&sas_host->lock);
1576
1577         transport_destroy_device(dev);
1578
1579         put_device(dev);
1580 }
1581 EXPORT_SYMBOL(sas_rphy_free);
1582
1583 /**
1584  * sas_rphy_delete  -  remove and free SAS remote PHY
1585  * @rphy:       SAS remote PHY to remove and free
1586  *
1587  * Removes the specified SAS remote PHY and frees it.
1588  */
1589 void
1590 sas_rphy_delete(struct sas_rphy *rphy)
1591 {
1592         sas_rphy_remove(rphy);
1593         sas_rphy_free(rphy);
1594 }
1595 EXPORT_SYMBOL(sas_rphy_delete);
1596
1597 /**
1598  * sas_rphy_unlink  -  unlink SAS remote PHY
1599  * @rphy:       SAS remote phy to unlink from its parent port
1600  *
1601  * Removes port reference to an rphy
1602  */
1603 void sas_rphy_unlink(struct sas_rphy *rphy)
1604 {
1605         struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1606
1607         parent->rphy = NULL;
1608 }
1609 EXPORT_SYMBOL(sas_rphy_unlink);
1610
1611 /**
1612  * sas_rphy_remove  -  remove SAS remote PHY
1613  * @rphy:       SAS remote phy to remove
1614  *
1615  * Removes the specified SAS remote PHY.
1616  */
1617 void
1618 sas_rphy_remove(struct sas_rphy *rphy)
1619 {
1620         struct device *dev = &rphy->dev;
1621
1622         switch (rphy->identify.device_type) {
1623         case SAS_END_DEVICE:
1624                 scsi_remove_target(dev);
1625                 break;
1626         case SAS_EDGE_EXPANDER_DEVICE:
1627         case SAS_FANOUT_EXPANDER_DEVICE:
1628                 sas_remove_children(dev);
1629                 break;
1630         default:
1631                 break;
1632         }
1633
1634         sas_rphy_unlink(rphy);
1635         bsg_remove_queue(rphy->q);
1636         transport_remove_device(dev);
1637         device_del(dev);
1638 }
1639 EXPORT_SYMBOL(sas_rphy_remove);
1640
1641 /**
1642  * scsi_is_sas_rphy  -  check if a struct device represents a SAS remote PHY
1643  * @dev:        device to check
1644  *
1645  * Returns:
1646  *      %1 if the device represents a SAS remote PHY, %0 else
1647  */
1648 int scsi_is_sas_rphy(const struct device *dev)
1649 {
1650         return dev->release == sas_end_device_release ||
1651                 dev->release == sas_expander_release;
1652 }
1653 EXPORT_SYMBOL(scsi_is_sas_rphy);
1654
1655
1656 /*
1657  * SCSI scan helper
1658  */
1659
1660 static int sas_user_scan(struct Scsi_Host *shost, uint channel,
1661                 uint id, u64 lun)
1662 {
1663         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1664         struct sas_rphy *rphy;
1665
1666         mutex_lock(&sas_host->lock);
1667         list_for_each_entry(rphy, &sas_host->rphy_list, list) {
1668                 if (rphy->identify.device_type != SAS_END_DEVICE ||
1669                     rphy->scsi_target_id == -1)
1670                         continue;
1671
1672                 if ((channel == SCAN_WILD_CARD || channel == 0) &&
1673                     (id == SCAN_WILD_CARD || id == rphy->scsi_target_id)) {
1674                         scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id,
1675                                          lun, SCSI_SCAN_MANUAL);
1676                 }
1677         }
1678         mutex_unlock(&sas_host->lock);
1679
1680         return 0;
1681 }
1682
1683
1684 /*
1685  * Setup / Teardown code
1686  */
1687
1688 #define SETUP_TEMPLATE(attrb, field, perm, test)                        \
1689         i->private_##attrb[count] = dev_attr_##field;           \
1690         i->private_##attrb[count].attr.mode = perm;                     \
1691         i->attrb[count] = &i->private_##attrb[count];                   \
1692         if (test)                                                       \
1693                 count++
1694
1695 #define SETUP_TEMPLATE_RW(attrb, field, perm, test, ro_test, ro_perm)   \
1696         i->private_##attrb[count] = dev_attr_##field;           \
1697         i->private_##attrb[count].attr.mode = perm;                     \
1698         if (ro_test) {                                                  \
1699                 i->private_##attrb[count].attr.mode = ro_perm;          \
1700                 i->private_##attrb[count].store = NULL;                 \
1701         }                                                               \
1702         i->attrb[count] = &i->private_##attrb[count];                   \
1703         if (test)                                                       \
1704                 count++
1705
1706 #define SETUP_RPORT_ATTRIBUTE(field)                                    \
1707         SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, 1)
1708
1709 #define SETUP_OPTIONAL_RPORT_ATTRIBUTE(field, func)                     \
1710         SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, i->f->func)
1711
1712 #define SETUP_PHY_ATTRIBUTE(field)                                      \
1713         SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, 1)
1714
1715 #define SETUP_PHY_ATTRIBUTE_RW(field)                                   \
1716         SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,       \
1717                         !i->f->set_phy_speed, S_IRUGO)
1718
1719 #define SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(field, func)                    \
1720         SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,       \
1721                           !i->f->func, S_IRUGO)
1722
1723 #define SETUP_PORT_ATTRIBUTE(field)                                     \
1724         SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)
1725
1726 #define SETUP_OPTIONAL_PHY_ATTRIBUTE(field, func)                       \
1727         SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, i->f->func)
1728
1729 #define SETUP_PHY_ATTRIBUTE_WRONLY(field)                               \
1730         SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, 1)
1731
1732 #define SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(field, func)                \
1733         SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, i->f->func)
1734
1735 #define SETUP_END_DEV_ATTRIBUTE(field)                                  \
1736         SETUP_TEMPLATE(end_dev_attrs, field, S_IRUGO, 1)
1737
1738 #define SETUP_EXPANDER_ATTRIBUTE(field)                                 \
1739         SETUP_TEMPLATE(expander_attrs, expander_##field, S_IRUGO, 1)
1740
1741 /**
1742  * sas_attach_transport  -  instantiate SAS transport template
1743  * @ft:         SAS transport class function template
1744  */
1745 struct scsi_transport_template *
1746 sas_attach_transport(struct sas_function_template *ft)
1747 {
1748         struct sas_internal *i;
1749         int count;
1750
1751         i = kzalloc(sizeof(struct sas_internal), GFP_KERNEL);
1752         if (!i)
1753                 return NULL;
1754
1755         i->t.user_scan = sas_user_scan;
1756
1757         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1758         i->t.host_attrs.ac.class = &sas_host_class.class;
1759         i->t.host_attrs.ac.match = sas_host_match;
1760         transport_container_register(&i->t.host_attrs);
1761         i->t.host_size = sizeof(struct sas_host_attrs);
1762
1763         i->phy_attr_cont.ac.class = &sas_phy_class.class;
1764         i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
1765         i->phy_attr_cont.ac.match = sas_phy_match;
1766         transport_container_register(&i->phy_attr_cont);
1767
1768         i->port_attr_cont.ac.class = &sas_port_class.class;
1769         i->port_attr_cont.ac.attrs = &i->port_attrs[0];
1770         i->port_attr_cont.ac.match = sas_port_match;
1771         transport_container_register(&i->port_attr_cont);
1772
1773         i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
1774         i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
1775         i->rphy_attr_cont.ac.match = sas_rphy_match;
1776         transport_container_register(&i->rphy_attr_cont);
1777
1778         i->end_dev_attr_cont.ac.class = &sas_end_dev_class.class;
1779         i->end_dev_attr_cont.ac.attrs = &i->end_dev_attrs[0];
1780         i->end_dev_attr_cont.ac.match = sas_end_dev_match;
1781         transport_container_register(&i->end_dev_attr_cont);
1782
1783         i->expander_attr_cont.ac.class = &sas_expander_class.class;
1784         i->expander_attr_cont.ac.attrs = &i->expander_attrs[0];
1785         i->expander_attr_cont.ac.match = sas_expander_match;
1786         transport_container_register(&i->expander_attr_cont);
1787
1788         i->f = ft;
1789
1790         count = 0;
1791         SETUP_PHY_ATTRIBUTE(initiator_port_protocols);
1792         SETUP_PHY_ATTRIBUTE(target_port_protocols);
1793         SETUP_PHY_ATTRIBUTE(device_type);
1794         SETUP_PHY_ATTRIBUTE(sas_address);
1795         SETUP_PHY_ATTRIBUTE(phy_identifier);
1796         SETUP_PHY_ATTRIBUTE(negotiated_linkrate);
1797         SETUP_PHY_ATTRIBUTE(minimum_linkrate_hw);
1798         SETUP_PHY_ATTRIBUTE_RW(minimum_linkrate);
1799         SETUP_PHY_ATTRIBUTE(maximum_linkrate_hw);
1800         SETUP_PHY_ATTRIBUTE_RW(maximum_linkrate);
1801
1802         SETUP_PHY_ATTRIBUTE(invalid_dword_count);
1803         SETUP_PHY_ATTRIBUTE(running_disparity_error_count);
1804         SETUP_PHY_ATTRIBUTE(loss_of_dword_sync_count);
1805         SETUP_PHY_ATTRIBUTE(phy_reset_problem_count);
1806         SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(link_reset, phy_reset);
1807         SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(hard_reset, phy_reset);
1808         SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(enable, phy_enable);
1809         i->phy_attrs[count] = NULL;
1810
1811         count = 0;
1812         SETUP_PORT_ATTRIBUTE(num_phys);
1813         i->port_attrs[count] = NULL;
1814
1815         count = 0;
1816         SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
1817         SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
1818         SETUP_RPORT_ATTRIBUTE(rphy_device_type);
1819         SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
1820         SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
1821         SETUP_RPORT_ATTRIBUTE(rphy_scsi_target_id);
1822         SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_enclosure_identifier,
1823                                        get_enclosure_identifier);
1824         SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_bay_identifier,
1825                                        get_bay_identifier);
1826         i->rphy_attrs[count] = NULL;
1827
1828         count = 0;
1829         SETUP_END_DEV_ATTRIBUTE(end_dev_ready_led_meaning);
1830         SETUP_END_DEV_ATTRIBUTE(end_dev_I_T_nexus_loss_timeout);
1831         SETUP_END_DEV_ATTRIBUTE(end_dev_initiator_response_timeout);
1832         SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_supported);
1833         SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_enabled);
1834         i->end_dev_attrs[count] = NULL;
1835
1836         count = 0;
1837         SETUP_EXPANDER_ATTRIBUTE(vendor_id);
1838         SETUP_EXPANDER_ATTRIBUTE(product_id);
1839         SETUP_EXPANDER_ATTRIBUTE(product_rev);
1840         SETUP_EXPANDER_ATTRIBUTE(component_vendor_id);
1841         SETUP_EXPANDER_ATTRIBUTE(component_id);
1842         SETUP_EXPANDER_ATTRIBUTE(component_revision_id);
1843         SETUP_EXPANDER_ATTRIBUTE(level);
1844         i->expander_attrs[count] = NULL;
1845
1846         return &i->t;
1847 }
1848 EXPORT_SYMBOL(sas_attach_transport);
1849
1850 /**
1851  * sas_release_transport  -  release SAS transport template instance
1852  * @t:          transport template instance
1853  */
1854 void sas_release_transport(struct scsi_transport_template *t)
1855 {
1856         struct sas_internal *i = to_sas_internal(t);
1857
1858         transport_container_unregister(&i->t.host_attrs);
1859         transport_container_unregister(&i->phy_attr_cont);
1860         transport_container_unregister(&i->port_attr_cont);
1861         transport_container_unregister(&i->rphy_attr_cont);
1862         transport_container_unregister(&i->end_dev_attr_cont);
1863         transport_container_unregister(&i->expander_attr_cont);
1864
1865         kfree(i);
1866 }
1867 EXPORT_SYMBOL(sas_release_transport);
1868
1869 static __init int sas_transport_init(void)
1870 {
1871         int error;
1872
1873         error = transport_class_register(&sas_host_class);
1874         if (error)
1875                 goto out;
1876         error = transport_class_register(&sas_phy_class);
1877         if (error)
1878                 goto out_unregister_transport;
1879         error = transport_class_register(&sas_port_class);
1880         if (error)
1881                 goto out_unregister_phy;
1882         error = transport_class_register(&sas_rphy_class);
1883         if (error)
1884                 goto out_unregister_port;
1885         error = transport_class_register(&sas_end_dev_class);
1886         if (error)
1887                 goto out_unregister_rphy;
1888         error = transport_class_register(&sas_expander_class);
1889         if (error)
1890                 goto out_unregister_end_dev;
1891
1892         return 0;
1893
1894  out_unregister_end_dev:
1895         transport_class_unregister(&sas_end_dev_class);
1896  out_unregister_rphy:
1897         transport_class_unregister(&sas_rphy_class);
1898  out_unregister_port:
1899         transport_class_unregister(&sas_port_class);
1900  out_unregister_phy:
1901         transport_class_unregister(&sas_phy_class);
1902  out_unregister_transport:
1903         transport_class_unregister(&sas_host_class);
1904  out:
1905         return error;
1906
1907 }
1908
1909 static void __exit sas_transport_exit(void)
1910 {
1911         transport_class_unregister(&sas_host_class);
1912         transport_class_unregister(&sas_phy_class);
1913         transport_class_unregister(&sas_port_class);
1914         transport_class_unregister(&sas_rphy_class);
1915         transport_class_unregister(&sas_end_dev_class);
1916         transport_class_unregister(&sas_expander_class);
1917 }
1918
1919 MODULE_AUTHOR("Christoph Hellwig");
1920 MODULE_DESCRIPTION("SAS Transport Attributes");
1921 MODULE_LICENSE("GPL");
1922
1923 module_init(sas_transport_init);
1924 module_exit(sas_transport_exit);